Bounty of the Sea
Volcanic vents deep in the Great Eastern Ocean
slowly belch metals and minerals into the waters. A particular quirk of the ocean's currents then concentrates these riches in the Rorian sea. Over the millenia, the concentrations of these riches have slowly become greater, while the local flora and fauna slowly adapted to live in these conditions. The riches attracted the Rorian
gnomes, who re-named the sea after themselves.